21215046103 has 4 divisors (see below), whose sum is σ = 21215386960. Its totient is φ = 21214705248.

The previous prime is 21215046071. The next prime is 21215046121. The reversal of 21215046103 is 30164051212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21215046103 - 2⁵ = 21215046071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215046143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47523 + ... + 211396.

It is an arithmetic number, because the mean of its divisors is an integer number (5303846740).

Almost surely, 2^21215046103 is an apocalyptic number.

21215046103 is a deficient number, since it is larger than the sum of its proper divisors (340857).

21215046103 is an equidigital number, since it uses as much as digits as its factorization.

21215046103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340856.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21215046103 its reverse (30164051212), we get a palindrome (51379097315).

The spelling of 21215046103 in words is "twenty-one billion, two hundred fifteen million, forty-six thousand, one hundred three".